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Expel the air with a vacuum pump
(Please refer to its manual for the way of using manifold value.)
1. Loosen and remove the maintenance nuts of stop values A and B, and connect the charge hose of
the manifold value with the maintenance terminator of stop value A. (Be sure that stop values A and
B are both closed)
2. Connect the joint of the charge hose with the vacuum pump.
3. Open the Lo-lever of the manifold value completely.
4. Turn on the vacuum pump. At the beginning of pumping, loosen the
maintenance terminator nut of stop value B a little to check whether
the air comes in (the sound of the pump changes, and the indicator of
compound meter turns below zero). Then fasten the nut.
5. When the pumping has finished, close the Lo-lever of the manifold
value completely and turn off the vacuum pump.
When you have pumped for over 15 minutes, please confirm that the
•
indicator of multi-meter is on 1.0 x 10
6. Loosen and remove the quadrangle cover of stop values A and B to
open stop value A and B completely, then fasten them.
7. Disassemble the charge hose from the repair-mouth of stop value A, and fasten the nut.
CAUTIONS
Chart 26
CHECK THE LEAKAGE
Check all the joints with the leak detector or soap water. (refer to Chart 29)
NOTE: in the chart
A
Lo-stop value
B
Hi-stop value
C,D
Joints of the connecting pipe to the indoor unit.
INSULATION
• Be sure to with insulating materials cover all the exposed parts of the flare pipe joints and refrigerant
pipe on the liquid-side and the gas-side. Ensure that there is no gap between them.
• Incomplete insulation may cause water condensation.
(3) Additional charge
When the length of the one-way pipe is less than 5 m, additional refrigerant charge after vacuuming is
not necessary.
When the length of one-way pipe is over 8m, the quantity to be added is as follows (unit in gram):
Connective pipe length
Less than 8m
Over 8m
-5
Pa(-76cmHg).
All the stop values should be opened before test operation. Each air
conditioner has two stop values of different sizes on the side of the outdoor
unit which operate as Lo-stop value and Hi-stop value, respectively.
(Refer to Chart 26)
Air purging method
Use refrigerant of outdoor unit
Use vacuum pump or refrigerant
cylinder
Additional amount of refrigerant to be charged
30g(length-5m) (capacity≤20000btu/h.)
65g(length-5m) (capacity≥24000btu/h.)
17
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